# Cosmological Parameters from pre-Planck CMB Measurements: a 2017 Update

## TL;DR

This paper updates cosmological constraints using 9-year WMAP, ACT, and SPT data, emphasizing the impact of neutrino mass and reionization assumptions on the $
m{ extLambda}$CDM model, and provides publicly available parameter chains.

## Contribution

It provides an updated analysis of cosmological parameters incorporating small-scale data and neutrino mass effects, improving the consistency of constraints across different experiments.

## Key findings

- Neutrino mass of 0.06 eV affects cosmological constraints.
- Small differences in reionization assumptions are detectable.
- Updated results are recommended for cross-survey comparisons.

## Abstract

We present cosmological constraints from the combination of the full mission 9-year WMAP release and small-scale temperature data from the pre-Planck ACT and SPT generation of instruments. This is an update of the analysis presented in Calabrese et al. 2013 and highlights the impact on $\Lambda$CDM cosmology of a 0.06 eV massive neutrino - which was assumed in the Planck analysis but not in the ACT/SPT analyses - and a Planck-cleaned measurement of the optical depth to reionization. We show that cosmological constraints are now strong enough that small differences in assumptions about reionization and neutrino mass give systematic differences which are clearly detectable in the data. We recommend that these updated results be used when comparing cosmological constraints from WMAP, ACT and SPT with other surveys or with current and future full-mission Planck cosmology. Cosmological parameter chains are publicly available on the NASA's LAMBDA data archive.